Systems and methods of RF tower transmission, modulation, and amplification, including embodiments for compensating for waveform distortion

a technology of rf tower and waveform distortion, applied in the field of vector combining power amplification, can solve the problems of phase and amplitude errors, gain and phase imbalance, and the magnitude of phase shift transform may not be exactly as theoretically or practically desired, and achieve the effect of cost saving
US8031804B2Inactive Publication Date: 2011-10-04PARKER VISION INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
PARKER VISION INC
Publication Date
2011-10-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and / or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and / or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present application claims the benefit of U.S. Provisional Patent Application No. 60 / 794,121 filed on Apr. 24, 2006, U.S. Provisional Patent Application No. 60 / 797,653 filed on May 5, 2006, and U.S. Provisional Patent Application No. 60 / 798,750 filed on May 9, 2006, all of which are incorporated herein by reference in their entireties.BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates generally to RF power transmission, modulation, and amplification. More particularly, the invention relates to methods and systems for vector combining power amplification.

[0004] 2. Background Art

[0005] In power amplifiers, a complex tradeoff typically exists between linearity and power efficiency.

[0006] Linearity is determined by a power amplifier's operating range on a characteristic curve that relates its input to output variables—the more linear the operating range the more linear the power amplifier is said to...

Claims

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